I doubt that inside the doors is a good place. When you roll down a wet window, or wash your car period, water does get inside there, not sure how much, but thats the reason we have a clear plastic liner there. One way or another they may get wet/corroded and pooch on you. But mounting them under the passengr seat wouldnt be good for ME cuz people sitting in the back seat have a bad habit of steppin on stuff on their way out. Plus its a long way to run the wires Thats why the amp will be under the drivers seat.